Don Wilhelm wrote:
First do a test to see if your NB is working at all. Remove the
antenna, turn on the Preamp, then tap on the case of Q21 with a
screwdriver. The taps will create impulse noise in the receiver which
Has it actually been established that the problem noise is impulsive?
The main source of published research on real time noise reduction of
audible signals seems to be the hearing aid industry. I just came
across this article suggesting that hearing aid noise reduction
strategies make people think that the noise is less sever, but don't
actually make the signal
Hello elecrafters,
after rechecking all my filters with sprectrogram, i noticed that there is a
ripple of about 10 db in all SSB filter settings without the OP1 settings. Is
this normal for this kind of filters. Is it possible to reduce the ripple?
vy 73 Michael, DC0ZO
k2# 6614, k3#1999
David Woolley (E.L) wrote:
The main source of published research on real time noise reduction of
audible signals seems to be the hearing aid industry. I just came
across this article suggesting that hearing aid noise reduction
strategies make people think that the noise is less sever,
Michael,
That kind of ripple is normal when the variable xtal filter is operated
at wide bandwidths, but it still provides an intelligible signal
(surprisingly).
Since you are using Spectrogram, check the actual width of those wide
filters. Typically on newer K2s the actual width is much
Dear Jonathan,Robin,Ted,Art,David and Bud,the requested info about NR settings
and MP3 files showing how well it works was sent to all of you.
Gary I sent it to you as well but your address rfena...@gmail.com was
corrupted,it was sent back to me,if you provide me with a pproper addy I will
Ok Jay yours was sent as well,73
AD4C
The difference between genius and stupidity is that genius has its limits. --
Albert Einstein
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Hi gang,
The weekly Elecraft SSB net will meet Sunday, 8/30/09 at 1800Z on 14.316
MHz. Hopefully, we will have good propagation. See you there.
73,
Phil, NS7P
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Bill W4ZV wrote:
David Woolley (E.L) wrote:
The main source of published research on real time noise reduction of
audible signals seems to be the hearing aid industry. I just came
across this article suggesting that hearing aid noise reduction
strategies make people think that
If you guys are interested to see how
I have set my K3 serial 2192 for best performance of the newest FW 3.27
this is what you will have to do:
1-type www.ad4c.com
2-Once you have it opened click on the right green botton named Downloads
3-Once you are in the new page,click again on Downloads- 99
Bill W4ZV wrote:
[about NR and SNR]
I've been watching this thread with interest. For a few years and several
different
radios, I've been repeating the same test:
1) Tune around with a bandwidth of about 400 Hz. Find a weak CW signal close to
the noise
which I can't copy 100%.
2) Try all
WTB hand mike for K2
Jack, NI8N
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It seems you were right, Eric. I had my K3 open for surgery recently
to install the KRX3. Of course, that involved lots of repositioning
of the coax cables. I also took the opportunity to make sure all the
internal screws were tight. When I got everything back together, the
encoder
I recently had an issue with electric fences (living in a rural environment),
the AGC PLS did not seem to make a lot of a difference and the noise blanker
was unable to mask the loud clicks.
Now with Beta 3.27, while everyone is talking about noise reduction, I
notice that the noise blanker can
Just to reiterate my earlier posting, the next beta release of the K3
mcu/dsp code will have -BOTH- NR methods available. (Those from 3.25 and
3.27. ) You really -can- have it your way. :-)
You will be able to scan though the same 16 3.27 settings as now,
followed by the set of 16 3.25 style
Nice job. The file is AD4C K3-33, not 63...I listened to all your files. In
every case, SSB was harder to understand (muffled) with the NR on and in
spite of the noise, much easier to understand with NR off. CW sounded great
with NR on. My opinion.
Steve
N4LQ
n...@carolina.rr.com
-
BlankAn S3 speaker in the P3 cabinet -with- the already-designed
AF1 audio filter integrated into the box would meet the needs
of those wanting an audio filter. Something along the lines
of the external speaker for the Yaesu FT-1000D / FT-990's,
for example.
Ken Kopp - K0PP
That is really very good reading, if highly technical. Helps to make a
little index card with all the abbreviations used.
One thing clearly suggested by the article is that immense efforts to tailor
the K3 NR based upon complaints/praise, or measurable improvement of
intelligibility, are, stated
Ditto that. The CW performance sounds awesome. SSB... Better with it turned off.
Bill W5WVO
Steve Ellington wrote:
Nice job. The file is AD4C K3-33, not 63...I listened to all your
files. In every case, SSB was harder to understand (muffled) with the
NR on and in spite of the noise, much
I have had some results like Richard, on 40 meters the Chinese dragon
has been active again and in the past the K3 is useless against this type
of radar. Much to my surprise it blanked the Dragon this time, I have
some distant power line noise that I was also never able to blank and
now the K3
I'm still evaluating the NR settings here. On strong SSB signals, it
sounds OK to me, but seems to limit or compress weaker voice signals.
I've been pleased with the improvement to CW signals, though the
settings available don't seem to change output characteristics much on
a strong CW signal.
Typo. Tnx Don for picking that up. Yes, I mean NR. I like the way the NB
works.
I do see a reduction in audio when turning on the NR with SSB. As an
example, I usually have the AF control around 9-9:30 position using an
external speaker or my Heil headphones. When I turn on the NR I have to use
Which noise blanker are you and Richard talking about - the hardware
blanker or the DSP blanker?
Bob NW8L
On Sat, Aug 29, 2009 at 10:48 AM, Merv Schweigertk...@flex.com wrote:
I have had some results like Richard, on 40 meters the Chinese dragon
has been active again and in the past the K3
I want to use a Collins 30L-1 amp with my K3, when I plug the 30L-1 amp
control cable into the K3 KEY OUT jack, the 30L-1 keys. The 30L-1 is keyed
by grounding it's key line (pulling -160 DC to ground). The K3 specs says
+200 VDC, at 5 amps, I guess the K3 does not like the minus voltage on the
I'm running 3.27/2.25 on K3 #569, mostly CW. No EQ, default AGC settings.
The NR is so improved (for CW at least) with this version that for the
first time I'm tempted to actually use it!. Normally I simply reduce
DSP BW to overcome noise when working the weaker CW signals, but like
to use a
Tony .
Yeah, I couldn't have said it better about the NR as it is now - you
nailed it. See what the next few DSP f/w's have!
I had an IC 746 (not PRO) - the NR on it was great and it was just
that - Noise Reduction, pure and simple. We took it to V47 about 6
years ago and it was
An odd thing happened today, I was tuning through an area on 20m where I
have a birdie, about 14.270-14.273.
The noise reduction was on at 1-3 I think, I don't know what state the
notch filter was at or the noise blanker, as I tuned into this area the
audio was a bit odd, like screechy, I
Hi everyone.
I'm out of date with with recent list correspondence, but does anyone happen to
know how or if the P3 device can be used with a K2? The P3-K3 interconnect
photos are certainly appealing, but I'm not a K3 user. I assume that an IF
interconnection would be required for the K2, but
Butch,
The HEXFET used in the K3 KEY OUT circuit has a diode to protect against
negative voltage excursions. I do not know how much negative voltage it
will stand, but it is possible you exceeded the limit. That diode
conducting is the reason your amp was keyed every time you plugged it
Bob Cunnings wrote:
Which noise blanker are you and Richard talking about - the hardware
blanker or the DSP blanker?
Bob NW8L
On Sat, Aug 29, 2009 at 10:48 AM, Merv Schweigertk...@flex.com wrote:
I have had some results like Richard, on 40 meters the Chinese dragon
has been active
Bob,
Both! But mainly the AGC PLS which has become very effective
Richard - HB9ANM
Richard Squire wrote:
Bob Cunnings wrote:
Which noise blanker are you and Richard talking about - the hardware
blanker or the DSP blanker?
Bob NW8L
On Sat, Aug 29, 2009 at 10:48 AM, Merv
Now I can make this happen repeatedly, with the NR at 1-4 and the notch
filter on auto as I tune across the birdie the volume goes very loud, it
is louder than any noise I can get the radio to do normally with the AF
all the way up.
I have discovered that this only does this in the NR 1-1 to
This same thing happened to me this morning. I had headphones on and it
really caught me by surprise. I passed it off as something I probably
did, but apparently it is an issue. I may have been at the same NR
selection, too. Very odd.
Dan -- N3ND
I am trying to use M1-M4 for frequency recall (DVR not installed).
I pick a frequency, tap VM, TAP M1. I then put in a new frequency, tap MV
and tap M1.
I then see a message NOT SET with no frequency change.
Can anyone tell me what I am doing wrong
Joe
W1JGS
-
Joe
W1JGS
--
View this
HiButch,
Do not hook the K3 directly to the 30L-1. The K3 only switches positive
voltages to ground on TX. Hooking up a negative voltage will not work
and may damage the Keyout keying transistor.
An external relay or a negative voltage keying transistor buffer are the
best ways to do this.
Please download the latest beta test code off the web site
(k3fw3r27a.zip) and replace the DSP 2.24 code with the newer 2.25 DSP
code. (The mcu version stays the same.)
This is the issue we addressed when we changed the dsp from 2.24 to 2.25
late in the week.
73, Eric
Bob W Allen wrote:
I want to use a Collins 30L-1 amp with my K3, when I plug the 30L-1 amp
control cable into the K3 KEY OUT jack, the 30L-1 keys. The 30L-1 is
keyed
by grounding it's key line (pulling -160 DC to ground).
Butch:
Consider this alternative:
http://home.att.net/~jacksonharbor/keyall.htm
It's
Joe,
Your exact sequence works for me.
When you say put in a new frequency - is that frequency still in the
same band as you recorded the M1 frequency? It must be within the same
band - the M1 thru M4 memories are *per* band. If you change bands you
have a different set of 4 memories that
Eric,
No No no, I have been grossly misinterpreted. I never asked for a combination
of 3.25 and 3.27. BOTH of these NR's are far from aggressive enough for my
type of Noise floor and Narrow band CW work. Furthermore they take WAY too long
to build the filters.
What I was asking for was
Hello All,
On 160 M when I rotate the RIT knob fast to change
the frequency I have some kind of image, Not sure what
this is ??
This occurred with an Antenna , Dose not occur without an antenna .
I can stop in the signal , and when I rotate the main tuning knob
one increment or so the signal goes
Steve,
I'm in the process of acquiring all the parts necessary to run a
panadapter with the K2. I'll be using my computer/sound card for
display. I already have a couple of high performance sound cards to
experiment with.
First piece is the Clifton Laboratories Z-1 Buffer/Amp for the IF
Please download the latest beta test code off the web site
(k3fw3r27a.zip) and replace the DSP 2.24 code with the newer 2.25 DSP
code. (The mcu version stays the same.)
This is the issue we addressed when we changed the dsp from 2.24 to 2.25
late in the week.
73, Eric
This was sent from Eric
Bob, for me its both, on the Dragon it takes both to do the job,
DSP T2-5 and IF Nar 5 removed the Dragon quite well ..
On the distant line noise I can sometimes get by with just the
IF blanker, but usually takes both there also. But less aggressive
settings.
Merv KH7C
Which noise blanker
I may have misspoken. Re-reading my emails with Wayne and Lyle
indicates the 'old' NR included in the next release (in addition to the
current NR method) will be that of DSP 2.22, which I think is what you
are referring to. :-)
73, Eric
The Smiths wrote:
Eric,
No No no, I have been
Hello All,
Sorry I forgot to indicate this is with K3
On 160 M when I rotate the RIT knob fast to change
the frequency I have some kind of image, Not sure what
this is ??
This occurred with an Antenna , Dose not occur without an antenna .
I can stop in the signal , and when I rotate the main
Man that will be a lot of settings but after reading all the posts I'd
had exactly the same idea but just didn't post it. Having a little
down time here after kayaking back from the neighbors on the other
side of the bay for lunch. Figured I'd look in and catch up. I'm
anxiously awaiting the
I recently installed a KRX3 in my K3. I currently only have the 13kHZ
and 400Hz filters installed in it. (This is a temporary situation as
I'm waiting for a matched 2.7kHz filter from Elecraft.) The filters
are configured correctly according to both the CONFIG menu and the K3
Utility.
Apparently this was not the fix, they (Lyle and ??) are working on it
now. Watch out it is a very loud noise especially with the head phones on.
Bob
KB1FRW
Bob Allen wrote:
Please download the latest beta test code off the web site
(k3fw3r27a.zip) and replace the DSP 2.24 code with the newer
Is anybody else unable to download the firmware from the FTP Site?
I have not been able to download yesterday or today.
Rich
K3RWN
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I copied the URL and pasted it at the top of IE in the destination box and
then it worked.
Steve, W2MY
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net]on Behalf Of bearcat
Sent: Saturday, August 29, 2009 6:57 PM
To:
Hi Folks
I can't seem to get the Sub RX noise blanker to function.
Working fine on the main RX.
When swapping to the Sub the NB icon is not showing and
cannot be toggled on.
Ver 3.27
thanks
Paul
zl1ajy
--
View this message in context:
BlankAn S3 speaker in the P3 cabinet -with- the already-designed
AF1 audio filter integrated into the box would meet the needs
of those wanting an audio filter. Something along the lines
of the external speaker for the Yaesu FT-1000D / FT-990's,
for example.
Ken Kopp - K0PP
Bob:
The Birdie? What birdie are you speak of that we too might tune across it.
I have this urge to listen to caddisflies.
Steve
N4LQ
n...@carolina.rr.com
- Original Message -
From: Bob W Allen mc...@gmavt.net
To: elecraft@mailman.qth.net; supp...@elecraft.com
Sent: Saturday, August 29,
Good Evening,
Another pleasant week. A few heavy fogs have rolled in off the Pacific
Ocean and yesterday some real rain. Today I found the deck wet a couple times
but never heard it falling. When I walked outside I could feel very heavy mist
hit my face but I know this was not a fog rain
test
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